一轮：
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given a list of integers, return themaximum length of alternating odd & even numbers
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given a binary tree, traverse the tree.[very easy, 1 recursion]
二轮：
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trapped rain water
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given a matrix of 0, 1, and 2s. 2 is thedestination, 1 can be visited, 0 cannot be visited. Also given a start point,return true if can reach the destination. [BFS]
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linked list, delete a value
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given a list of tasks and itsdependencies, find the order to execute all the tasks
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design an AI for playing the WordScrumble game